5
5.0

Feb 4, 2020
02/20

by
Jessie Scherzer & Brooklyn Hughes

audio

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eye 5

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Join us as we discuss Chronic Wasting Disease. Here we will brainstorm different types of natural treatment possibilities for this fast paced disease.

2
2.0

Feb 3, 2020
02/20

by
Jessie Scherzer & Brooklyn Hughes

audio

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eye 2

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Join Jessie and Brooklyn as we discuss our food system

0
0.0

Feb 3, 2020
02/20

by
Jessie Scherzer & Brooklyn Hughes

audio

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eye 0

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comment 0

Join us as Jessie explains the importance of Mushrooms.

15
15

Jan 7, 2019
01/19

by
Scherzer, Carl J

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eye 15

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142 p. 21 cm

Topic: Church work with the sick

2
2.0

Jun 30, 2018
06/18

by
Elena Beretta; Maarten V. de Hoop; Lingyun Qiu; Otmar Scherzer

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We study the inverse boundary value problem for the Helmholtz equation using the Dirichlet-to-Neumann map at selected frequency as the data. We develop an explicit reconstruction of the wavespeed using a multi-level nonlinear projected steepest descent iterative scheme in Banach spaces. We consider wavespeeds containing discontinuities. A conditional Lipschitz stability estimate for the inverse problem holds for wavespeeds of the form of a linear combination of piecewise constant functions with...

Topics: Mathematics, Numerical Analysis

Source: http://arxiv.org/abs/1406.2391

3
3.0

Jun 29, 2018
06/18

by
Clemens Kirisits; Otmar Scherzer

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Convergence rates results for variational regularization methods typically assume the regularization functional to be convex. While this assumption is natural for scalar-valued functions, it can be unnecessarily strong for vector-valued ones. In this paper we focus on regularization functionals with polyconvex integrands. Even though such functionals are nonconvex in general, it is possible to derive linear convergence rates with respect to a generalized Bregman distance, an idea introduced by...

Topics: Optimization and Control, Mathematics

Source: http://arxiv.org/abs/1612.06724

2
2.0

Jun 29, 2018
06/18

by
Peter Elbau; Leonidas Mindrinos; Otmar Scherzer

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Optical coherence tomography (OCT) and photoacoustic tomography (PAT) are emerging non-invasive biological and medical imaging techniques. It is a recent trend in experimental science to design experiments that perform PAT and OCT imaging at once. In this paper we present a mathematical model describing the dual experiment. Since OCT is mathematically modelled by Maxwell's equations or some simplifications of it, whereas the light propagation in quantitative photoacoustics is modelled by...

Topics: Analysis of PDEs, Mathematical Physics, Numerical Analysis, Mathematics

Source: http://arxiv.org/abs/1601.03320

6
6.0

Jun 30, 2018
06/18

by
Wolf Naetar; Otmar Scherzer

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The goal of quantitative photoacoustic tomography is to determine optical and acoustical material properties from initial pressure maps as obtained, for instance, from photoacoustic imaging. The most relevant parameters are absorption, diffusion and Grueneisen coefficients, all of which can be heterogeneous. Recent work by Bal and Ren shows that in general, unique reconstruction of all three parameters is impossible, even if multiple measurements of the initial pressure (corresponding to...

Topics: Mathematics, Analysis of PDEs

Source: http://arxiv.org/abs/1403.2620

50
50

Sep 22, 2013
09/13

by
Kowar Richard; Scherzer Otmar; Bonnefond Xavier

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The work is inspired by thermo-and photoacoustic imaging, where recent efforts are devoted to take into account attenuation and varying wave speed parameters. In this paper we derive and analyze causal equations describing propagation of attenuated pressure waves. We also review standard models, like frequency power laws, and the thermo-viscous equation and show that they lack causality in the parameter range relevant for biological photoacoustic imaging. To discuss causality in mathematical...

Source: http://arxiv.org/abs/0906.4678v2

3
3.0

Jun 29, 2018
06/18

by
Ian A. Frigaard; José A. Iglesias; Gwenael Mercier; Christiane Pöschl; Otmar Scherzer

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We consider the fluid mechanical problem of identifying the critical yield number $Y_c$ of a dense solid inclusion (particle) settling under gravity within a bounded domain of Bingham fluid, i.e. the critical ratio of yield stress to buoyancy stress that is sufficient to prevent motion. We restrict ourselves to a two-dimensional planar configuration with a single anti-plane component of velocity. Thus, both particle and fluid domains are infinite cylinders of fixed cross-section. We show that...

Topics: Optimization and Control, Fluid Dynamics, Physics, Mathematics

Source: http://arxiv.org/abs/1608.01200

2
2.0

Jun 28, 2018
06/18

by
Zakaria Belhachmi; Thomas Glatz; Otmar Scherzer

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This paper investigates photoacoustic tomography with two spatially varying acoustic parameters, the compressibility and the density. We consider the reconstruction of the absorption density parameter (imaging parameter of Photoacoustics) with complete and partial measurement data. We investigate and analyze three different numerical methods for solving the imaging problem and compare the results.

Topics: Optimization and Control, Mathematics

Source: http://arxiv.org/abs/1512.07411

2
2.0

Jun 28, 2018
06/18

by
Vinicius Albani; Peter Elbau; Maarten V. de Hoop; Otmar Scherzer

texts

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eye 2

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In this paper, we prove optimal convergence rates results for regularisation methods for solving linear ill-posed operator equations in Hilbert spaces. The result generalises existing convergence rates results on optimality to general source conditions, such as logarithmic source conditions. Moreover, we also provide optimality results under variational source conditions and show the connection to approximative source conditions.

Topics: Functional Analysis, Numerical Analysis, Mathematics

Source: http://arxiv.org/abs/1511.02950

23
23

Dec 20, 2011
12/11

by
Barron, Cheryl Carter; Scherzer, Cathy Carmichael

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eye 23

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Includes index

Topic: Children's parties

186
186

Jan 10, 2016
01/16

by
Johann Adam Scherzer

texts

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eye 186

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Topic: bub_upload

Source: http://books.google.com/books?id=3xBpyUEdKXoC&hl=&source=gbs_api

276
276

Aug 29, 2016
08/16

by
Scherzer, Karl, Ritter von, 1821-1903

texts

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eye 276

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Fold. map in pocket (v. 1)

Topic: bub_upload

Source: http://books.google.com/books?id=xDkMAAAAIAAJ&hl=&source=gbs_api

4
4.0

Jun 30, 2018
06/18

by
Roman Andreev; Peter Elbau; Maarten V. de Hoop; Lingyun Qiu; Otmar Scherzer

texts

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eye 4

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In recent years, a series of convergence rates conditions for regularization methods has been developed. Mainly, the motivations for developing novel conditions came from the desire to carry over convergence rates results from the Hilbert space setting to generalized Tikhonov regularization in Banach spaces. For instance, variational source conditions have been developed and they were expected to be equivalent to standard source conditions for linear inverse problems in a Hilbert space setting....

Topics: Functional Analysis, Mathematics, Numerical Analysis

Source: http://arxiv.org/abs/1409.7610

2
2.0

Jun 29, 2018
06/18

by
Peter Elbau; Otmar Scherzer; Cong Shi

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We analyse the ill-posedness of the photoacoustic imaging problem in the case of an attenuating medium. To this end, we introduce an attenuated photoacoustic operator and determine the asymptotic behaviour of its singular values. Dividing the known attenuation models into strong and weak attenuation classes, we show that for strong attenuation, the singular values of the attenuated photoacoustic operator decay exponentially, and in the weak attenuation case the singular values of the attenuated...

Topics: Spectral Theory, Functional Analysis, Analysis of PDEs, Mathematics

Source: http://arxiv.org/abs/1611.05807

Folder 1: Clippings and other, mostly published materials (items 1-57); 1940-1976

Source: lbiead

3
3.0

Jun 30, 2018
06/18

by
Thomas Glatz; Otmar Scherzer; Thomas Widlak

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eye 3

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Elastographic imaging is a widely used technique which can in principle be implemented on top of every imaging modality. In elastography, the specimen is exposed to a force causing local displacements in the probe, and imaging is performed before and during the displacement experiment. From the computed displacements material parameters can be deduced, which in turn can be used for clinical diagnosis. Photoacoustic imaging is an emerging image modality, which exhibits functional and...

Topics: Mathematics, Numerical Analysis, Optimization and Control

Source: http://arxiv.org/abs/1407.6982

3
3.0

Jun 28, 2018
06/18

by
Julian Schmid; Thomas Glatz; Behrooz Zabihian; Mengyang Liu; Wolfgang Drexler; Otmar Scherzer

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To obtain the initial pressure from the collected data on a planar sensor arrangement in photoacoustic tomography, there exists an exact analytic frequency domain reconstruction formula. An efficient realization of this formula needs to cope with the evaluation of the data's Fourier transform on a non-equispaced mesh. In this paper, we use the non-uniform fast Fourier transform to handle this issue and show its feasibility in 3D experiments with real and synthetic data. This is done in...

Topics: Mathematics, Optimization and Control, Medical Physics, Physics

Source: http://arxiv.org/abs/1510.01078

0
0.0

Apr 24, 2021
04/21

by
Christian Scherzer (DMCL-GB-Avatar)

data

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Customized version of http://www.thingiverse.com/thing:46889 Created with Customizer! http://www.thingiverse.com/apps/customizer/run?thing_id=46889

Topics: stl, customized, Coins & Badges, thingiverse

0
0.0

Apr 24, 2021
04/21

by
Christian Scherzer (DMCL-GB-Avatar)

data

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eye 0

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Customized version of http://www.thingiverse.com/thing:46889 Created with Customizer! http://www.thingiverse.com/apps/customizer/run?thing_id=46889

Topics: stl, customized, Coins & Badges, thingiverse

0
0.0

Apr 24, 2021
04/21

by
Christian Scherzer (DMCL-GB-Avatar)

data

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eye 0

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favorite 0

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Customized version of http://www.thingiverse.com/thing:46889 Created with Customizer! http://www.thingiverse.com/apps/customizer/run?thing_id=46889

Topics: stl, customized, Coins & Badges, thingiverse

0
0.0

Apr 24, 2021
04/21

by
Christian Scherzer (DMCL-GB-Avatar)

data

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eye 0

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Customized version of http://www.thingiverse.com/thing:46889 Created with Customizer! http://www.thingiverse.com/apps/customizer/run?thing_id=46889

Topics: stl, customized, Coins & Badges, thingiverse

4
4.0

Jun 30, 2018
06/18

by
Peter Elbau; Leonidas Mindrinos; Otmar Scherzer

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eye 4

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In this chapter a general mathematical model of Optical Coherence Tomography (OCT) is presented on the basis of the electromagnetic theory. OCT produces high resolution images of the inner structure of biological tissues. Images are obtained by measuring the time delay and the intensity of the backscattered light from the sample considering also the coherence properties of light. The scattering problem is considered for a weakly scattering medium located far enough from the detector. The...

Topics: Mathematics, Numerical Analysis

Source: http://arxiv.org/abs/1403.0726

5
5.0

Jun 30, 2018
06/18

by
Thomas Widlak; Otmar Scherzer

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eye 5

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The goal of quantitative elastography is to identify biomechanical parameters from interior displacement data, which are provided by other modalities, such as ultrasound or magnetic resonance imaging. In this paper, we analyze the stability of several linearized problems in quantitative elastography. Our method is based on the theory of redundant systems of linear partial differential equations. We analyze the ellipticity properties of the corresponding PDE systems augmented with the interior...

Topics: Mathematics, Analysis of PDEs

Source: http://arxiv.org/abs/1406.0291

0
0.0

Feb 4, 2020
02/20

by
Jessie Scherzer & Brooklyn Hughes

audio

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eye 0

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favorite 0

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comment 0

What is snow albedo & what the heck does dust have to do with it?

3
3.0

Feb 3, 2020
02/20

by
Jessie Scherzer & Brooklyn Hughes

audio

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eye 3

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favorite 0

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Join Jessie and Brooklyn as we discuss the Real Food Challenge at Colorado Mountain College in Steamboat Springs, Colorado.

2
2.0

Jun 29, 2018
06/18

by
Aniello Raffaele Patrone; Christian Valuch; Ulrich Ansorge; Otmar Scherzer

texts

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eye 2

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Saliency maps are used to understand human attention and visual fixation. However, while very well established for static images, there is no general agreement on how to compute a saliency map of dynamic scenes. In this paper we propose a mathematically rigorous approach to this prob- lem, including static saliency maps of each video frame for the calculation of the optical flow. Taking into account static saliency maps for calculating the optical flow allows for overcoming the aperture...

Topics: Computer Vision and Pattern Recognition, Computing Research Repository

Source: http://arxiv.org/abs/1606.07324

Cornell University Library

1,889
1.9K

Oct 27, 2009
10/09

by
Scherzer, Karl, Ritter von, 1821-1903; Wüllerstorf-Urbair, Bernhard, Freiherr von, 1816-1883; Humboldt, Alexander von, 1769-1859

texts

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The metadata below describe the original scanning. Follow the "All Files: HTTP" link in the "View the book" box to the left to find XML files that contain more metadata about the original images and the derived formats (OCR results, PDF etc.). See also the What is the directory structure for the texts? FAQ for information about file content and naming conventions.

favoritefavoritefavoritefavorite ( 1 reviews )

Topics: Novara Expedition, 1857-1859, Voyages around the world

3
3.0

Feb 4, 2020
02/20

by
Jessie Scherzer & Brooklyn Hughes

audio

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eye 3

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favorite 0

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comment 0

Join us as Jessie explains the importance of wastewater treatment.

9
9.0

Jun 27, 2018
06/18

by
Aniello Raffale Patrone; Otmar Scherzer

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eye 9

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In this paper we present a decomposition algorithm for computation of the spatial-temporal optical flow of a dynamic image sequence. We consider several applications, such as the extraction of temporal motion features and motion detection in dynamic sequences under varying illumination conditions, such as they appear for instance in psychological flickering experiments. For the numerical implementation we are solving an integro-differential equation by a fixed point iteration. For comparison...

Topics: Computer Vision and Pattern Recognition, Computing Research Repository

Source: http://arxiv.org/abs/1505.03505

33
33

Sep 18, 2013
09/13

by
Markus Grasmair; Markus Haltmeier; Otmar Scherzer

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eye 33

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We consider the stable approximation of sparse solutions to non-linear operator equations by means of Tikhonov regularization with a subquadratic penalty term. Imposing certain assumptions, which for a linear operator are equivalent to the standard range condition, we derive the usual convergence rate $O(\sqrt{\delta})$ of the regularized solutions in dependence of the noise level $\delta$. Particular emphasis lies on the case, where the true solution is known to have a sparse representation in...

Source: http://arxiv.org/abs/0806.3222v3

47
47

Sep 24, 2013
09/13

by
T. Widlak; O. Scherzer

texts

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eye 47

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Hybrid imaging techniques utilize couplings of physical modalities -- they are called hybrid, because, typically, the excitation and measurement quantities belong to different modalities. Recently there has been an enormous research interest in this area because these methods promise very high resolution. In this paper we give a review on hybrid tomography methods for \emph{electrical conductivity} imaging. The reviewed imaging methods utilize couplings between electric, magnetic and ultrasound...

Source: http://arxiv.org/abs/1112.2958v3

206
206

Jul 7, 2014
07/14

by
Scherzer, Karl , ritter von, 1821-1903

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eye 206

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Topic: Faustino I, Emperor of Haiti, 1789?-1867

12
12

Oct 22, 2019
10/19

by
Carl Heinrich Von Scherzer

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eye 12

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favorite 0

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comment 0

49
49

Sep 18, 2013
09/13

by
Konstantinos Kalimeris; Otmar Scherzer

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eye 49

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In this paper we derive time reversal imaging functionals for two strongly causal acoustic attenuation models, which have been proposed recently. The time reversal techniques are based on recently proposed ideas of Ammari et al for the thermo-viscous wave equation. Here and there an asymptotic analysis provides reconstruction functionals from first order corrections for the attenuating effect. In addition, we present a novel approach for higher order corrections.

Source: http://arxiv.org/abs/1211.1516v1

6
6.0

Jun 28, 2018
06/18

by
Zakaria Belhachmi; Thomas Glatz; Otmar Scherzer

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The standard approach for photoacoustic imaging with variable speed of sound is time reversal, which consists in solving a well-posed final-boundary value problem for the wave equation backwards in time. This paper investigates the iterative Landweber regularization algorithm, where convergence is guaranteed by standard regularization theory, notably also in cases of trapping sound speed or for short measurement times. We formulate and solve the direct and inverse problem on the whole Euclidean...

Topics: Optimization and Control, Mathematics

Source: http://arxiv.org/abs/1507.01741

47
47

Sep 23, 2013
09/13

by
Andreas Kirsch; Otmar Scherzer

texts

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eye 47

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In this paper we propose an approach for \emph{simultaneous} identification of the \emph{absorption density} and the \emph{speed of sound} by photoacoustic measurements. Experimentally our approach can be realized with sliced photoacoustic experiments. The mathematical model for such an experiment is developed and exact reconstruction formulas for both parameters are presented.

Source: http://arxiv.org/abs/1109.5795v1

37
37

Sep 18, 2013
09/13

by
G. Zangerl; O. Scherzer; M. Haltmeier

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A method for photoacoustic tomography is presented that uses circular integrals of the acoustic wave for the reconstruction of a three-dimensional image. Image reconstruction is a two-step process: In the first step data from a stack of circular integrating are used to reconstruct the circular projection of the source distribution. In the second step the inverse circular Radon transform is applied. In this article we establish inversion formulas for the first step, which involves an inverse...

Source: http://arxiv.org/abs/0809.2052v3

53
53

Sep 22, 2013
09/13

by
Markus Grasmair; Monika Muszkieta; Otmar Scherzer

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In this paper, we present a method for the numerical minimization of the Mumford-Shah functional that is based on the idea of topological asymptotic expansions. The basic idea is to cover the expected edge set with balls of radius \epsilon > 0 and use the number of balls, multiplied with 2\epsilon, as an estimate for the length of the edge set. We introduce a functional based on this idea and prove that it converges in the sense of \Gamma-limits to the Mumford-Shah functional. Moreover, we...

Source: http://arxiv.org/abs/1103.4722v2

14
14

Jun 28, 2018
06/18

by
José A. Iglesias; Martin Rumpf; Otmar Scherzer

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eye 14

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A shape sensitive, variational approach for the matching of surfaces considered as thin elastic shells is investigated. The elasticity functional to be minimized takes into account two different types of nonlinear energies: a membrane energy measuring the rate of tangential distortion when deforming the reference shell into the template shell, and a bending energy measuring the bending under the deformation in terms of the change of the shape operators from the undeformed into the deformed...

Topics: Computational Geometry, Optimization and Control, Computing Research Repository, Mathematics

Source: http://arxiv.org/abs/1509.06559

0
0.0

Apr 24, 2021
04/21

by
Christian Scherzer (DMCL-GB-Avatar)

data

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eye 0

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Customized version of http://www.thingiverse.com/thing:46889 Created with Customizer! http://www.thingiverse.com/apps/customizer/run?thing_id=46889

Topics: stl, customized, Coins & Badges, thingiverse

1
1.0

Mar 4, 2021
03/21

by
Roland Scherzer (rolijoker)

data

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eye 1

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comment 0

Yamaha Akku Halter für Befestigung auf einer Fläche mit Aussparung zum Aufladen Yamaha Akku Desktop Mount 0,2mm 30% infill no support no raft

Topics: Hobby, stl, thingiverse

0
0.0

Apr 23, 2021
04/21

by
Christian Scherzer (DMCL-GB-Avatar)

data

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eye 0

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comment 0

Customized version of http://www.thingiverse.com/thing:46889 Created with Customizer! http://www.thingiverse.com/apps/customizer/run?thing_id=46889

Topics: stl, customized, Coins & Badges, thingiverse

45
45

Oct 25, 2014
10/14

by
Scherzer, Pnina; Katalan, Shachaf; Got, Gay; Pizov, Galina; Londono, Irene; Gal-Moscovici, Anca; Popovtzer, Mordecai M.; Ziv, Ehud; Bendayan, Moise

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This article is from Anatomy & Cell Biology , volume 44 . Abstract The Psammomys obesus lives in natural desert habitat on low energy (LE) diet, however when maintained in laboratory conditions with high energy (HE) diet it exhibits pathological metabolic changes resembling those of type 2 diabetes. We have evaluated and correlated the histopathology, metabolic and functional renal alterations occurring in the diabetic Psammomys. Renal function determined by measuring glomerular filtration...

Source: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3195821

4
4.0

Jun 28, 2018
06/18

by
Elena Beretta; Maarten V. de Hoop; Florian Faucher; Otmar Scherzer

texts

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eye 4

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We study the inverse boundary value problem for the Helmholtz equation using the Dirichlet-to-Neumann map at selected frequencies as the data. A conditional Lipschitz stability estimate for the inverse problem holds in the case of wavespeeds that are a linear combination of piecewise constant functions (following a domain partition) and gives a framework in which the scheme converges. The stability constant grows exponentially as the number of subdomains in the domain partition increases. We...

Topics: Analysis of PDEs, Mathematics

Source: http://arxiv.org/abs/1510.02366